Color-coated sheet coating uniformity detection method and system based on spectral analysis

Abstract

The invention relates to the technical field of spectral analysis and detection, and particularly discloses a color-coated sheet coating uniformity detection method and system based on spectral analysis, and the method comprises the steps: carrying out the reflection-transmission dual-channel spectrum synchronous collection of a color-coated sheet coating, carrying out the dynamic distortion correction and noise stripping, and increasing the environment temperature of a color-coated sheet production line. The method comprises the following steps: forming a color-coated sheet coating thermal response abnormal distribution diagram, carrying out abnormal diagnosis on a color-coated sheet coating, carrying out color-coated sheet coating finish paint-primer-substrate defect characteristic fusion analysis to obtain a color-coated sheet coating defect characteristic diagram, carrying out color-coated sheet coating uniformity calibration, and outputting a color-coated sheet coating uniformity defect grade. And a closed-loop feedback control scheme of the coating of the color-coated sheet is determined. The problems that a traditional color-coated sheet coating uniformity detection method is high in subjectivity, low in precision and low in efficiency, the requirements for detection precision and speed are difficult to meet, and the detection requirement of a multi-layer coating structure of a color-coated sheet cannot be met are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of spectral analysis detection, in particular to a color-coated sheet coating uniformity detection method and system based on spectral analysis. BACKGROUND

[0002] With the development of various industries, the quality requirements for color-coated sheets are increasing. Coating uniformity, as one of the key factors affecting the quality of color-coated sheets, is directly related to the corrosion resistance, aesthetics, and service life of the color-coated sheets. Non-uniform coating may cause accelerated local corrosion, color inconsistency, and other problems, reducing the overall quality and value of the product. Spectral analysis technology has the advantages of speed, accuracy, non-contact, quantification, etc., and can quickly and accurately analyze the composition and thickness of the coating of the color-coated sheet. By measuring the absorption, reflection, or emission characteristics of different wavelengths of light by the coating, the chemical composition and structure information of the coating can be obtained, and the uniformity of the coating can be inferred. Moreover, spectral analysis technology can realize automatic detection and can be integrated with the production line to realize real-time online detection, improving production efficiency and product quality stability.

[0003] Traditional color-coated sheet coating uniformity detection methods, such as manual visual observation and touch, have the disadvantages of strong subjectivity, low precision, and low efficiency, and cannot meet the requirements of modern large-scale industrial production for detection precision and speed. Manual detection cannot detect small changes in coating thickness or color differences, affecting the accuracy of the detection results. Some physical detection methods, such as the "contrast plate" method, cannot guarantee precision, and the eddy current method can only detect metal materials or non-metal materials on metal substrates and can only detect a single layer, which cannot meet the detection requirements of color-coated sheets with multi-layer coating structures. SUMMARY

[0004] To overcome the deficiencies of the prior art, the present application provides a color-coated sheet coating uniformity detection method and system based on spectral analysis, which can effectively solve the problems involved in the background art.

[0005] To achieve the above object, the present application is implemented by the following technical solutions: the present application provides a color coated plate coating uniformity detection method based on spectral analysis, comprising the following steps: performing color coated plate coating reflection-transmission dual-channel spectrum synchronous acquisition, outputting original reflection spectrum matrix and transmission spectrum matrix bound with spatial coordinates; collecting the shaking offset in the production process of the color coated plate and the background blackbody radiation spectrum when the non-color coated plate passes through the production line, performing dynamic distortion correction and noise stripping on the original reflection spectrum matrix and transmission spectrum matrix, and outputting the position-calibrated pure reflection spectrum and transmission spectrum; raising the ambient temperature of the color coated plate production line, combining the position-calibrated pure reflection spectrum and transmission spectrum, forming a color coated plate coating thermal response abnormal distribution graph, and performing abnormal diagnosis on the color coated plate coating; based on the color coated plate coating thermal response abnormal distribution graph and the position-calibrated pure reflection spectrum and transmission spectrum, performing color coated plate coating topcoat-primer-substrate defect feature fusion analysis to obtain a color coated plate coating defect feature graph; obtaining color coated plate production feature data, analyzing to obtain a color coated plate uniformity dynamic tolerance set, combining the color coated plate coating defect feature graph to calibrate the color coated plate coating uniformity, and outputting the color coated plate coating uniformity defect grade, and determining the color coated plate coating closed-loop feedback control scheme based on the color coated plate coating uniformity defect grade.

[0006] As a further method, color coated plate coating reflection-transmission dual-channel spectrum synchronous acquisition is performed, and original reflection spectrum matrix and transmission spectrum matrix bound with spatial coordinates are outputted, and the specific analysis process is as follows: based on a laser positioner, the position of the color coated plate is monitored in real time; when the laser positioner detects that the color coated plate reaches a set sampling point, the probes of the reflection channel and the transmission channel are synchronously triggered according to a set sampling interval to perform dual-channel spectrum synchronous acquisition, so as to ensure that the spatial coordinates of the sampling points are aligned; based on a spectral probe array, the reflection spectrum signal of the color coated plate coating is collected, the reflection spectrum signal collected by the spectral probe array is collected and stored in real time, and an original reflection spectrum matrix is formed; based on a transmission spectrometer, the transmission spectrum signal of the color coated plate coating is collected, the transmission spectrum signal collected by the transmission spectrometer is collected and stored in real time, and an original transmission spectrum matrix is formed; original reflection spectrum matrix and transmission spectrum matrix bound with spatial coordinates are outputted.

[0007] As a further method, the original reflectance spectrum matrix and the transmission spectrum matrix are dynamically distorted and noise is stripped, and the position calibrated pure reflectance spectrum and transmission spectrum are output, and the specific analysis process is: high-precision acceleration sensors are installed at key positions of the production line roller shaft to monitor the shaking of the color coated plate in the production process in real time, the data collected by the acceleration sensors are analyzed and processed through a signal processing algorithm, and the shaking offset of the color coated plate is calculated; the shaking offset of the color coated plate is obtained, the reflectance spectrum matrix and the transmission spectrum matrix sampling coordinate reverse correction scheme mapping set is obtained, based on the shaking offset of the current color coated plate, the matching reflectance spectrum matrix and transmission spectrum matrix sampling coordinate reverse correction scheme is determined, and the original reflectance spectrum matrix and transmission spectrum matrix sampling coordinate are reversely corrected; the background blackbody radiation spectrum is collected when the color coated plate passes through the production line, and the background blackbody radiation spectrum is deducted from the original reflectance spectrum matrix and transmission spectrum matrix; and the position calibrated pure reflectance spectrum and transmission spectrum are output.

[0008] As a further method, the temperature of the color coated plate production line environment is improved, and the position calibrated pure reflectance spectrum and transmission spectrum are combined to form a color coated plate coating thermal response abnormal distribution map, and the color coated plate coating is abnormally diagnosed, and the specific analysis process is: an annular infrared heater is arranged beside the spectrum probe to ensure that the annular infrared heater can emit uniform infrared radiation to the set sampling point, the annular infrared heater emits heat to the set sampling point according to the set three-order temperature rise pulse, and the set three-order temperature rise pulse is 60℃→80℃→100℃; the mid-infrared spectrometer is used to record the mid-infrared spectrum at each temperature stage synchronously, and the peak value of the characteristic peak is measured; for each set sampling point, the characteristic peak peak value offset of the color coated plate is calculated at different temperature stages, the value of the characteristic peak peak value offset is bound with the spatial coordinates of the set sampling point, and a thermal response abnormal distribution map is formed; the standard prediction value of the characteristic peak peak value offset of the color coated plate cured well area with temperature rise stored in the database is obtained; the actual measured characteristic peak peak value offset is compared with the standard prediction value of the characteristic peak peak value offset with temperature rise; if the absolute value of the difference between the actual measured characteristic peak peak value offset of the set sampling point and the standard prediction value of the characteristic peak peak value offset with temperature rise is higher than the offset critical value stored in the database, the color coated plate coating of the set sampling point has an abnormality; if the absolute value of the difference between the actual measured characteristic peak peak value offset of the set sampling point and the standard prediction value of the characteristic peak peak value offset with temperature rise is not higher than the offset critical value stored in the database, the color coated plate coating of the set sampling point has no abnormality; the comparison results of the actual measured characteristic peak peak value offset of each sampling point and the standard prediction value of the characteristic peak peak value offset with temperature rise are updated to the color coated plate coating thermal response abnormal distribution map.

[0009] As a further method, based on the color coated plate coating thermal response abnormal distribution map and the position calibrated pure reflection spectrum and transmission spectrum, the color coated plate coating finish primer substrate defect feature fusion analysis is carried out, and the color coated plate coating defect feature map is obtained, and the specific analysis process is: the set sampling point position of the color coated plate coating existing abnormality in the color coated plate coating thermal response abnormal distribution map is obtained, the set sampling point position of the color coated plate coating existing abnormality is carried out color coated plate coating finish primer substrate defect feature fusion analysis; the defect feature analysis of the color coated plate coating finish is carried out: when the position calibrated pure reflection spectrum is mutated in the 600-700 nanometer wave band, but the position calibrated pure transmission spectrum is normal, if the characteristic peak peak value offset amount lags behind more than 15%, it is judged that the color coated plate coating finish local curing is poor; the defect feature analysis of the color coated plate coating primer is carried out: when the position calibrated pure transmission spectrum is abnormal in the primer characteristic wave band, but the position calibrated pure reflection spectrum is normal, if the characteristic peak peak value offset amount jumps, it is judged that the color coated plate coating primer micropore or delamination; the defect feature analysis of the color coated plate coating substrate is carried out: when the position calibrated pure reflection spectrum and transmission spectrum are normal but the characteristic peak peak value offset amount is higher than the characteristic peak peak value offset threshold value stored in the database, it is judged that the color coated plate coating substrate pretreatment residual oil stain; based on the color coated plate coating finish primer substrate defect feature fusion analysis result, the color coated plate coating thermal response abnormal distribution map is updated, and the color coated plate coating defect feature map is obtained.

[0010] As a further method, the color coated plate production characteristic data is obtained, and the color coated plate uniformity dynamic tolerance set is analyzed, and the specific analysis process is: the color coated plate production characteristic data is obtained, and specifically includes the wet film thickness of coating process, the electrostatic voltage of coating process and the environmental humidity of color coated plate production line; based on the color coated plate production characteristic data, the color coated plate production characteristic factor is comprehensively analyzed, and the color coated plate production characteristic factor is used as the analysis basis for analyzing the color coated plate uniformity dynamic tolerance set; the color coated plate production characteristic factor-color coated plate uniformity dynamic tolerance set mapping set stored in the database is obtained, the matching color coated plate uniformity dynamic tolerance set is determined based on the current color coated plate production characteristic factor; the color coated plate uniformity dynamic tolerance set specifically includes the color coated plate coating finish local curing bad sampling point number dynamic tolerance, the color coated plate coating primer micropore or delamination sampling point number dynamic tolerance, and the color coated plate coating substrate pretreatment residual oil stain sampling point number dynamic tolerance.

[0011] As a further method, the color coated plate production characteristic factor is specifically analyzed as follows: ; In the formula, The color coated plate production characteristic factor is The wet film thickness of coating process is The electrostatic voltage of coating process is For the color coated sheet production line environment humidity, For the set Weight factor of the For the set Weight factor of the For the set Weight factor of the

[0012] As a further method, the color coated sheet coating uniformity is calibrated in combination with the color coated sheet coating defect feature map, and the color coated sheet coating uniformity defect level is output, and the specific analysis process is: based on the color coated sheet coating defect feature map, the color coated sheet coating topcoat local curing bad sampling point number, the color coated sheet coating primer micro-hole or delamination sampling point number, and the color coated sheet coating substrate pretreatment residual oil sampling point number are obtained; the color coated sheet coating topcoat local curing bad sampling point threshold value, the color coated sheet coating primer micro-hole or delamination sampling point threshold value, and the color coated sheet coating substrate pretreatment residual oil sampling point threshold value stored in the database are obtained; The difference between the color coated sheet coating topcoat local curing bad sampling point number and the color coated sheet coating topcoat local curing bad sampling point threshold value is recorded as the color coated sheet coating topcoat local curing bad offset; the difference between the color coated sheet coating primer micro-hole or delamination sampling point number and the color coated sheet coating primer micro-hole or delamination sampling point threshold value is recorded as the color coated sheet coating primer micro-hole or delamination offset; the difference between the color coated sheet coating substrate pretreatment residual oil sampling point number and the color coated sheet coating substrate pretreatment residual oil sampling point threshold value is recorded as the color coated sheet coating substrate pretreatment residual oil offset; If the color coated sheet coating topcoat local curing bad offset is not lower than the color coated sheet coating topcoat local curing bad sampling point number dynamic tolerance, the color coated sheet coating uniformity calibration is out of limit for the color coated sheet coating topcoat local curing bad; if the color coated sheet coating primer micro-hole or delamination offset is not lower than the color coated sheet coating primer micro-hole or delamination sampling point number dynamic tolerance, the color coated sheet coating uniformity calibration is out of limit for the color coated sheet coating primer micro-hole or delamination; if the color coated sheet coating substrate pretreatment residual oil offset is not lower than the color coated sheet coating substrate pretreatment residual oil sampling point number dynamic tolerance, the color coated sheet coating uniformity calibration is out of limit for the color coated sheet coating substrate pretreatment residual oil; If there is one and below out of limit in the color coated sheet coating uniformity calibration, the color coated sheet coating uniformity defect level is low; if there are two out of limit in the color coated sheet coating uniformity calibration, the color coated sheet coating uniformity defect level is medium; if there are three out of limit in the color coated sheet coating uniformity calibration, the color coated sheet coating uniformity defect level is high.

[0013] As a further method, a color-coated sheet coating closed-loop feedback control scheme is determined based on a color-coated sheet coating uniformity defect level, and a specific analysis process is as follows: the number of color-coated sheet coating top paint local curing defect sampling points, the number of color-coated sheet coating primer micro-hole or delamination sampling points, the number of color-coated sheet coating substrate pretreatment residual oil sampling points, and a color-coated sheet uniformity dynamic tolerance set are taken as inputs of a trained graph neural network model based on causal reasoning; an output color-coated sheet coating closed-loop feedback control scheme is output, specifically including an updated spray gun atomization pressure value, an updated substrate preheating temperature value, an updated baking time, and an updated production line conveying speed value; and the color-coated sheet production line parameters are automatically adjusted based on the color-coated sheet coating closed-loop feedback control scheme.

[0014] The second aspect of the present application provides a color-coated sheet coating uniformity detection system based on spectral analysis, comprising: a dual-channel spectral synchronous acquisition module for performing color-coated sheet coating reflection-transmission dual-channel spectral synchronous acquisition, outputting an original reflection spectrum matrix and a transmission spectrum matrix bound with spatial coordinates; a dual-channel spectral calibration module for acquiring the jitter offset in the production process of the color-coated sheet and the background blackbody radiation spectrum when the production line passes through the achromatic color-coated sheet, performing dynamic distortion correction and noise stripping on the original reflection spectrum matrix and the transmission spectrum matrix, and outputting a pure reflection spectrum and a transmission spectrum after position calibration; a color-coated sheet coating anomaly diagnosis module for improving the ambient temperature of the color-coated sheet production line, combining the position-calibrated pure reflection spectrum and the transmission spectrum, forming a color-coated sheet coating thermal response anomaly distribution map, and performing anomaly diagnosis on the color-coated sheet coating; a coating defect feature map analysis module for performing color-coated sheet coating top paint-primer-substrate defect feature fusion analysis based on the color-coated sheet coating thermal response anomaly distribution map and the position-calibrated pure reflection spectrum and transmission spectrum, and obtaining a color-coated sheet coating defect feature map; a color-coated sheet coating uniformity calibration module for obtaining color-coated sheet production feature data, analyzing to obtain a color-coated sheet uniformity dynamic tolerance set, combining the color-coated sheet coating defect feature map to calibrate the color-coated sheet coating uniformity, and outputting a color-coated sheet coating uniformity defect level, and determining a color-coated sheet coating closed-loop feedback control scheme based on the color-coated sheet coating uniformity defect level.

[0015] Compared with the prior art, the embodiments of the present application have at least the following advantages or beneficial effects: The present application provides a color-coated plate coating uniformity detection method and system based on spectral analysis. Through double-channel spectral synchronous acquisition, the optical information of the coating surface (reflectance spectrum) and the interior (transmittance spectrum) can be obtained simultaneously, forming a three-dimensional detection dimension of "surface-internal", avoiding the information blind area of single-channel detection. When subsequent coating defects are found, the specific location can be accurately located, facilitating the production end to quickly trace the problem point, rather than making a vague judgment of the overall quality. The error rate of the corrected spectral data is significantly reduced, avoiding detection errors caused by environmental interference or mechanical errors, and laying a reliable data foundation for subsequent defect analysis. The thermal stability of each region of the coating is presented in a visual way, helping to identify early potential defects and avoid problems such as coating cracking and falling off caused by environmental temperature changes during product use. Coating defect feature fusion analysis breaks through the limitations of traditional detection focusing on a single coating, realizing full-chain defect positioning from the surface to the substrate. Combined with production feature data, a uniformity tolerance standard dynamically adjusted with production conditions is established. BRIEF DESCRIPTION OF DRAWINGS

[0016] The present application is further illustrated by the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present application. For ordinary skilled in the art, other drawings can be obtained without creative labor based on the following drawings.

[0017] Figure 1 The present application is further illustrated by the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present application. For ordinary skilled in the art, other drawings can be obtained without creative labor based on the following drawings.

[0018] Figure 2 The present application is further illustrated by the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present application. For ordinary skilled in the art, other drawings can be obtained without creative labor based on the following drawings. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0020] Referring to Figure 1 The present application provides a color-coated plate coating uniformity detection method and system based on spectral analysis. Through double-channel spectral synchronous acquisition, the optical information of the coating surface (reflectance spectrum) and the interior (transmittance spectrum) can be obtained simultaneously, forming a three-dimensional detection dimension of "surface-internal", avoiding the information blind area of single-channel detection. When subsequent coating defects are found, the specific location can be accurately located, facilitating the production end to quickly trace the problem point, rather than making a vague judgment of the overall quality. The error rate of the corrected spectral data is significantly reduced, avoiding detection errors caused by environmental interference or mechanical errors, and laying a reliable data foundation for subsequent defect analysis. The thermal stability of each region of the coating is presented in a visual way, helping to identify early potential defects and avoid problems such as coating cracking and falling off caused by environmental temperature changes during product use. Coating defect feature fusion analysis breaks through the limitations of traditional detection focusing on a single coating, realizing full-chain defect positioning from the surface to the substrate. Combined with production feature data, a uniformity tolerance standard dynamically adjusted with production conditions is established.

[0021] The specific analysis process is: based on the laser positioner, the position of the color coated plate is monitored in real time; when the laser positioner detects that the color coated plate reaches the set sampling point, the probes of the reflection channel and the transmission channel are triggered synchronously according to the set sampling interval to perform synchronous sampling of the double channels, so as to ensure the spatial coordinate alignment of the sampling point; based on the spectral probe array, the reflection spectrum signal of the color coated plate coating is collected, the reflection spectrum signal collected by the spectral probe array is collected and stored in real time, and an original reflection spectrum matrix is formed; based on the transmission spectrometer, the transmission spectrum signal of the color coated plate coating is collected, the transmission spectrum signal collected by the transmission spectrometer is collected and stored in real time, and an original transmission spectrum matrix is formed; and the original reflection spectrum matrix and the transmission spectrum matrix bound with spatial coordinates are output.

[0022] The laser positioner is used to monitor the position of the color coated plate in real time, and when the color coated plate reaches the sampling point, the double-channel probes are triggered synchronously at intervals to collect the spectrum signal. The reflection and transmission spectrum signals collected by the spectral probe array and the transmission spectrometer are respectively stored in real time as matrices, and the spatial coordinates are bound and output. Through accurate positioning and synchronous acquisition, the spatial consistency of the reflection and transmission spectrum data is ensured, and the detection error caused by time difference or position deviation is avoided; at the same time, the array and the instrument are combined to collect the matrix data, which provides complete and position-labeled spectrum information for subsequent multi-dimensional analysis, which not only facilitates accurate locking of the coating defect position, but also enables three-dimensional analysis of the coating characteristics from the surface to the inside, and significantly improves the reliability and analysis efficiency of the detection data.

[0023] The shaking offset amount of the color coated plate in the production process and the background blackbody radiation spectrum when the non-color coated plate on the production line passes are collected, and the original reflection spectrum matrix and the transmission spectrum matrix are dynamically distorted and corrected and noise is stripped to output the position-corrected pure reflection spectrum and the transmission spectrum.

[0024] The specific analysis process is: high-precision acceleration sensors are installed at key positions of the production line roller shaft to monitor the shaking of the color coated plate in the production process in real time. Through a signal processing algorithm, the data collected by the acceleration sensors are analyzed and processed to calculate the shaking offset amount of the color coated plate. A shaking offset amount-reflection spectrum matrix and transmission spectrum matrix sampling coordinate reverse correction scheme mapping set is obtained, based on the shaking offset amount of the current color coated plate, a matching reflection spectrum matrix and transmission spectrum matrix sampling coordinate reverse correction scheme is determined, and the original reflection spectrum matrix and the transmission spectrum matrix sampling coordinates are reversely corrected. The background blackbody radiation spectrum is collected when the non-color coated plate on the production line passes, and the background blackbody radiation spectrum is deducted from the original reflection spectrum matrix and the transmission spectrum matrix. The position-corrected pure reflection spectrum and the transmission spectrum are output.

[0025] The color coated plate shaking is monitored by installing high-precision acceleration sensors at key positions of the production line roller shaft, the shaking offset is calculated through signal processing, and the spectral sampling coordinates are inversely calibrated according to the offset-correction scheme mapping set, while the background blackbody radiation spectrum is collected when no plate passes and is deducted, and finally the pure spectrum after calibration is output. The deviation of the spectral acquisition position caused by the production shaking is effectively eliminated, the detection misjudgment caused by mechanical displacement is avoided, the noise generated by environmental interference is stripped, the spectral data truly reflects the optical properties of the coating, and more accurate and reliable data basis is provided for subsequent defect diagnosis and uniformity analysis, which significantly improves the precision and reliability of the detection results.

[0026] The ambient temperature of the color coated plate production line is improved, and the pure reflection spectrum and transmission spectrum after position calibration are combined to form an abnormal distribution diagram of the thermal response of the color coated plate coating, and the color coated plate coating is abnormally diagnosed.

[0027] The specific analysis process is as follows: an annular infrared heater is arranged beside the spectral probe to ensure that the annular infrared heater can emit uniform infrared radiation to the set sampling point, the annular infrared heater emits heat to the set sampling point according to the set three-step temperature rise pulse, and the set three-step temperature rise pulse is 60℃→80℃→100℃; the mid-infrared spectrometer is used to record the mid-infrared spectrum at each temperature stage synchronously, and the peak value of the characteristic peak is measured; for each set sampling point, the characteristic peak peak value offset of the color coated plate is calculated at different temperature stages, the value of the characteristic peak peak value offset is bound with the spatial coordinates of the set sampling point, and an abnormal distribution diagram of thermal response is formed; the standard predicted value of the characteristic peak peak value offset of the color coated plate well-cured area with temperature rise stored in the database is obtained; the actual measured characteristic peak peak value offset is compared with the standard predicted value of the characteristic peak peak value offset with temperature rise; if the absolute value of the difference between the actual measured characteristic peak peak value offset of the set sampling point and the standard predicted value of the characteristic peak peak value offset with temperature rise is higher than the offset critical value stored in the database, the color coated plate coating of the set sampling point has an abnormality; if the absolute value of the difference between the actual measured characteristic peak peak value offset of the set sampling point and the standard predicted value of the characteristic peak peak value offset with temperature rise is not higher than the offset critical value stored in the database, the color coated plate coating of the set sampling point has no abnormality; the comparison results of the actual measured characteristic peak peak value offset of each sampling point and the standard predicted value of the characteristic peak peak value offset with temperature rise are updated to the abnormal distribution diagram of thermal response of the color coated plate coating.

[0028] An annular infrared heater is arranged beside the spectral probe to emit uniform infrared radiation to the sampling point with a three-step temperature rise pulse of 60℃→80℃→100℃, the mid-infrared spectrometer is used to record the spectrum at each temperature stage synchronously and measure the characteristic peak peak value, the characteristic peak peak value offset at different temperature stages is calculated and bound with the spatial coordinates to form an abnormal distribution diagram of thermal response, and then compared with the standard predicted value of the well-cured area in the database to determine whether the coating has an abnormality.

[0029] Through the analysis of the dynamic change of spectral characteristics under thermal stimulation, the thermal response abnormalities caused by hidden problems such as poor curing, uneven thickness, stress concentration, etc. in the coating can be effectively identified, and the invisible defects are converted into visual thermal response offset data, breaking through the limitations of traditional normal temperature detection in identifying internal defects, realizing the deep diagnosis of the uniformity and curing quality of the coating, and providing an innovative detection dimension of thermal-spectral coupling for precise positioning of potential defects.

[0030] Based on the thermal response abnormal distribution map of the color coated sheet coating and the pure reflection spectrum and transmission spectrum calibrated by position, the defect feature fusion analysis of the color coated sheet coating topcoat-primer-substrate is carried out to obtain the defect feature map of the color coated sheet coating.

[0031] The specific analysis process is: obtaining the set sampling point position of the color coated sheet coating existing abnormal in the thermal response abnormal distribution map of the color coated sheet coating, and carrying out the defect feature fusion analysis of the color coated sheet coating topcoat-primer-substrate at the set sampling point position of the color coated sheet coating existing abnormal; carrying out defect feature analysis on the color coated sheet coating topcoat: when the position calibrated pure reflection spectrum mutates in the 600-700nm wave band, but the position calibrated pure transmission spectrum is normal, if the characteristic peak value offset amount lags behind more than 15%, it is determined that the color coated sheet coating topcoat is locally cured badly; carrying out defect feature analysis on the color coated sheet coating primer: when the position calibrated pure transmission spectrum is abnormal in the primer characteristic wave band, but the position calibrated pure reflection spectrum is normal, if the characteristic peak value offset amount jumps, it is determined that the color coated sheet coating primer has micropores or delamination; carrying out defect feature analysis on the color coated sheet coating substrate: when the position calibrated pure reflection spectrum and transmission spectrum are normal but the characteristic peak value offset amount is higher than the characteristic peak value offset threshold value stored in the database, it is determined that the color coated sheet coating substrate has residual oil stains; based on the defect feature fusion analysis result of the color coated sheet coating topcoat-primer-substrate, the thermal response abnormal distribution map of the color coated sheet coating is updated to obtain the defect feature map of the color coated sheet coating.

[0032] Fusion of thermal response abnormal distribution map and position calibrated reflection and transmission spectrum data, defect feature analysis of each level (topcoat, primer, substrate) of the coating: first locate the sampling point of thermal response abnormality, then determine the defect type according to the spectral characteristics and characteristic peak offset amount in different wave bands, such as local curing defect when the topcoat mutates in the 600-700nm wave band and the characteristic peak offset lags behind more than 15%, micropore or delamination when the primer characteristic wave band transmission spectrum is abnormal and the peak offset jumps, and residual oil stains on the substrate when the spectrum is normal but the peak offset exceeds the threshold value, finally update to form the defect feature map.

[0033] Through cross-validation of multi-source data, full-level defect positioning from the surface to the substrate is achieved, and thermal response anomalies are accurately correlated with spectral characteristics. This can not only identify apparent defects in the topcoat, but also penetrate and detect hidden problems in the primer and substrate, solving the blind spot problem of traditional single-level detection. It provides an integrated diagnostic solution for coating defects that combines positioning accuracy and cause analysis, helping the production end to accurately trace the source and optimize the process.

[0034] Acquire the production characteristic data of color-coated steel sheets, analyze and obtain the dynamic tolerance set of color-coated steel sheet uniformity, calibrate the color-coated steel sheet coating uniformity based on the color-coated steel sheet coating defect characteristic map, output the color-coated steel sheet coating uniformity defect level, and determine the color-coated steel sheet coating closed-loop feedback control scheme based on the color-coated steel sheet coating uniformity defect level.

[0035] The specific analysis process is as follows: obtaining the production characteristic data of color-coated plates, including the wet film thickness of the coating process, the electrostatic voltage of the coating process, and the environmental humidity of the color-coated plate production line; de-dimensionalizing the wet film thickness of the coating process, the electrostatic voltage of the coating process, and the environmental humidity of the color-coated plate production line, and comprehensively analyzing the production characteristic factors of the color-coated plates based on the production characteristic data of the color-coated plates. The production characteristic factors of the color-coated plates are used as the analysis basis for obtaining the dynamic tolerance set of the uniformity of the color-coated plates; obtaining the mapping set of the color-coated plate production characteristic factors and the dynamic tolerance set of the uniformity of the color-coated plates stored in the database, and determining the matching dynamic tolerance set of the uniformity of the color-coated plates based on the current production characteristic factors of the color-coated plates; the dynamic tolerance set of the uniformity of the color-coated plates specifically includes the dynamic tolerance for the number of sampling points for local poor curing of the color-coated plate coating topcoat, the dynamic tolerance for the number of sampling points for micropores or delamination of the color-coated plate coating primer, and the dynamic tolerance for the number of sampling points for residual oil stains in the pretreatment of the color-coated plate coating substrate.

[0036] The specific analysis process of the production characteristic factors of color-coated plates is as follows: ; Where, is the characteristic factor of color-coated plate production, is the wet film thickness of the coating process, is the electrostatic voltage of the coating process, The environmental humidity of the color-coated board production line is For the setting The weight factor, For the setting The weight factor, For the setting The weight factor of .

[0037] Based on the color coated sheet coating defect feature map, the number of color coated sheet coating topcoat local curing defect sampling points, the number of color coated sheet coating primer micro-hole or delamination sampling points, and the number of color coated sheet coating substrate pretreatment residual oil sampling points are obtained; the color coated sheet coating topcoat local curing defect sampling point threshold value, the color coated sheet coating primer micro-hole or delamination sampling point threshold value, and the color coated sheet coating substrate pretreatment residual oil sampling point threshold value stored in the database are obtained; The difference between the number of color coated sheet coating topcoat local curing defect sampling points and the color coated sheet coating topcoat local curing defect sampling point threshold value is recorded as the color coated sheet coating topcoat local curing defect offset; the difference between the number of color coated sheet coating primer micro-hole or delamination sampling points and the color coated sheet coating primer micro-hole or delamination sampling point threshold value is recorded as the color coated sheet coating primer micro-hole or delamination offset; the difference between the number of color coated sheet coating substrate pretreatment residual oil sampling points and the color coated sheet coating substrate pretreatment residual oil sampling point threshold value is recorded as the color coated sheet coating substrate pretreatment residual oil offset; If the color coated sheet coating topcoat local curing defect offset is not less than the dynamic tolerance of the number of color coated sheet coating topcoat local curing defect sampling points, the color coated sheet coating uniformity is marked as the color coated sheet coating topcoat local curing defect overrun; if the color coated sheet coating primer micro-hole or delamination offset is not less than the dynamic tolerance of the number of color coated sheet coating primer micro-hole or delamination sampling points, the color coated sheet coating uniformity is marked as the color coated sheet coating primer micro-hole or delamination overrun; if the color coated sheet coating substrate pretreatment residual oil offset is not less than the dynamic tolerance of the number of color coated sheet coating substrate pretreatment residual oil sampling points, the color coated sheet coating uniformity is marked as the color coated sheet coating substrate pretreatment residual oil overrun; If there is one or less overrun in the color coated sheet coating uniformity marking, the color coated sheet coating uniformity defect level is low; if there are two overruns in the color coated sheet coating uniformity marking, the color coated sheet coating uniformity defect level is medium; if there are three overruns in the color coated sheet coating uniformity marking, the color coated sheet coating uniformity defect level is high.

[0038] The number of color coated sheet coating topcoat local curing defect sampling points, the number of color coated sheet coating primer micro-hole or delamination sampling points, the number of color coated sheet coating substrate pretreatment residual oil sampling points, and the color coated sheet uniformity dynamic tolerance set are input into the trained causal reasoning based graph neural network model; the output is a color coated sheet coating closed-loop feedback control scheme, which specifically includes an updated spray gun atomization pressure value, an updated substrate preheating temperature value, an updated baking time, and an updated production line transmission speed value; based on the color coated sheet coating closed-loop feedback control scheme, the color coated sheet production line parameters are automatically adjusted.

[0039] The production characteristic factor is obtained by acquiring production characteristic data such as coating process wet film thickness, static voltage, production line environment humidity, and the like, and performing weighted calculation, and the dynamic tolerance set is determined in combination with the database mapping set; then, the number of sampling points of each defect is counted based on the coating defect feature map, and the offset is obtained by comparing the threshold value, and the uniformity overrun type is determined according to the offset and the dynamic tolerance set; after the defect level is divided by the overrun number, the defect data is input into the graph neural network model, and the closed-loop feedback control scheme such as spray gun atomization pressure and substrate preheating temperature is output, so that the production line parameter automatic adjustment is realized.

[0040] Based on the production whole-process data, the dynamic tolerance set is adapted to the actual working condition, the uniformity defect is accurately calibrated and graded; with the help of the intelligent model output control scheme, the "detection-analysis-control" closed loop is opened, and the production parameters are dynamically optimized, which not only improves the accuracy and adaptability of the coating uniformity detection, but also realizes the active prevention and process iteration of quality problems, and helps the intelligent and fine management and control upgrading of the color coated plate production.

[0041] Referring to Figure 2 The second aspect of the present application provides a color coated plate coating uniformity detection system based on spectral analysis, comprising: a double-channel spectrum synchronous acquisition module for performing color coated plate coating reflection-transmission double-channel spectrum synchronous acquisition, and outputting original reflection spectrum matrix and transmission spectrum matrix bound with spatial coordinates.

[0042] A double-channel spectrum calibration module is used for acquiring the jitter offset in the production process of the color coated plate and the background blackbody radiation spectrum when the production line passes through the non-color coated plate, performing dynamic distortion correction and noise stripping on the original reflection spectrum matrix and the transmission spectrum matrix, and outputting the position-calibrated pure reflection spectrum and transmission spectrum.

[0043] A color coated plate coating abnormality diagnosis module is used for improving the ambient temperature of the color coated plate production line, combining the position-calibrated pure reflection spectrum and transmission spectrum, forming a color coated plate coating thermal response abnormality distribution map, and performing abnormality diagnosis on the color coated plate coating.

[0044] A coating defect feature map analysis module is used for performing color coated plate coating topcoat-primer-substrate defect feature fusion analysis based on the color coated plate coating thermal response abnormality distribution map and the position-calibrated pure reflection spectrum and transmission spectrum, and obtaining a color coated plate coating defect feature map.

[0045] A color coated plate coating uniformity calibration module is used for acquiring color coated plate production characteristic data, analyzing to obtain a color coated plate uniformity dynamic tolerance set, performing color coated plate coating uniformity calibration in combination with the color coated plate coating defect feature map, outputting a color coated plate coating uniformity defect level, and determining a color coated plate coating closed-loop feedback control scheme based on the color coated plate coating uniformity defect level.

[0046] The above merely illustrates and describes the structure of the present application, and those skilled in the art can make various modifications or supplements to the described specific embodiments or adopt similar ways to replace, as long as the modifications or supplements do not deviate from the structure of the present application or exceed the scope defined by the present claims, and should belong to the protection scope of the present application.

Claims

1. A method for detecting the uniformity of color-coated sheet coating based on spectral analysis, characterized in that: The following steps are involved: Perform simultaneous acquisition of the reflection and transmission dual-channel spectra of the color-coated plate coating, and output the original reflection spectrum matrix and transmission spectrum matrix bound to the spatial coordinates; The jitter offset during the color-coated board production process and the background blackbody radiation spectrum when no color-coated boards pass through the production line are collected. Dynamic distortion correction and noise stripping are performed on the original reflection spectrum matrix and transmission spectrum matrix, and position-calibrated pure reflection spectrum and transmission spectrum are output. By increasing the ambient temperature of the color-coated plate production line and combining the position-calibrated pure reflection spectrum and transmission spectrum, a thermal response anomaly distribution map of the color-coated plate coating is formed, and abnormality diagnosis of the color-coated plate coating is performed; Based on the abnormal distribution map of thermal response of color-coated plate coating and the position-calibrated pure reflection spectrum and transmission spectrum, the defect characteristics of color-coated plate coating topcoat, primer and substrate are fused and analyzed to obtain the defect feature map of color-coated plate coating. Acquire the production characteristic data of color-coated steel sheets, analyze and obtain the dynamic tolerance set of color-coated steel sheet uniformity, calibrate the color-coated steel sheet coating uniformity based on the color-coated steel sheet coating defect characteristic map, output the color-coated steel sheet coating uniformity defect level, and determine the color-coated steel sheet coating closed-loop feedback control scheme based on the color-coated steel sheet coating uniformity defect level.

2. The method for detecting coating uniformity of color-coated steel sheets based on spectral analysis according to claim 1, characterized in that: The color-coated plate coating reflection-transmission dual-channel spectrum is synchronously collected, and the original reflection spectrum matrix and transmission spectrum matrix bound to the spatial coordinates are output. The specific analysis process is as follows: Based on the laser locator, the position of the color-coated plate is monitored in real time; When the laser locator detects that the color-coated plate reaches the set sampling point, it triggers the probes of the reflection channel and the transmission channel synchronously to perform dual-channel spectrum acquisition according to the set sampling interval to ensure that the spatial coordinates of the sampling point are aligned; The reflective spectrum signal of the color-coated plate coating is collected based on the spectrum probe array, and the reflective spectrum signal collected by the spectrum probe array is collected and stored in real time to form an original reflective spectrum matrix; The transmission spectrum signal of the color-coated plate coating is collected based on a transmission spectrometer, and the transmission spectrum signal collected by the transmission spectrometer is collected and stored in real time to form an original transmission spectrum matrix; Outputs the raw reflectance and transmission spectrum matrices in bound space coordinates.

3. The method for detecting coating uniformity of color-coated steel sheets based on spectral analysis according to claim 1, characterized in that: The original reflection spectrum matrix and transmission spectrum matrix are dynamically distorted and noise stripped to output position-calibrated pure reflection spectrum and transmission spectrum. The specific analysis process is as follows: High-precision acceleration sensors are installed at key locations on the production line rollers to monitor the jitter of the color-coated panels during production in real time. The data collected by the acceleration sensors is analyzed and processed using a signal processing algorithm to calculate the jitter offset of the color-coated panels. Obtain the mapping set of the jitter offset of the color-coated plate - the reverse correction scheme of the sampling coordinates of the reflection spectrum matrix and the transmission spectrum matrix. Based on the jitter offset of the current color-coated plate, determine the matching reverse correction scheme of the sampling coordinates of the reflection spectrum matrix and the transmission spectrum matrix, and perform reverse correction on the sampling coordinates of the original reflection spectrum matrix and the transmission spectrum matrix. Collect the background blackbody radiation spectrum when no color-coated board passes through the production line, and subtract the background blackbody radiation spectrum from the original reflection spectrum matrix and transmission spectrum matrix; Outputs position-calibrated clean reflectance and transmission spectra.

4. The method for detecting coating uniformity of color-coated steel sheets based on spectral analysis according to claim 1, characterized in that: The ambient temperature of the color-coated plate production line is increased, and the position-calibrated pure reflection spectrum and transmission spectrum are combined to form an abnormal distribution map of the thermal response of the color-coated plate coating, and abnormal diagnosis of the color-coated plate coating is performed. The specific analysis process is as follows: An annular infrared heater is arranged next to the spectrum probe to ensure that the annular infrared heater can emit uniform infrared radiation to the set sampling point. The annular infrared heater emits heat to the set sampling point according to the set third-order temperature rise pulse. The set third-order temperature rise pulse is 60℃→80℃→100℃. A mid-infrared spectrometer is used to synchronously record the mid-infrared spectra at each temperature step and measure the peak value of the characteristic peak; For each set sampling point, the characteristic peak-to-peak offset of the color-coated plate is calculated at different temperature levels, and the value of the characteristic peak-to-peak offset is bound to the spatial coordinates of the set sampling point to form a thermal response anomaly distribution map; Obtain the standard predicted value of the characteristic peak-to-peak shift with temperature rise in the well-cured area of ​​the color-coated plate stored in the database; Comparing the actual measured characteristic peak-to-peak shift with the standard predicted characteristic peak-to-peak shift with temperature rise; If the absolute value of the difference between the actual measured characteristic peak-to-peak offset of the set sampling point and the standard predicted value of the characteristic peak-to-peak offset with temperature rise is higher than the offset critical value stored in the database, then the color-coated plate coating at the set sampling point has an abnormality; If the absolute value of the difference between the actual measured characteristic peak-to-peak offset at the set sampling point and the standard predicted value of the characteristic peak-to-peak offset with temperature rise is not higher than the offset critical value stored in the database, then there is no abnormality in the color-coated plate coating at the set sampling point; The actual measured characteristic peak-to-peak value offset of each sampling point is compared with the standard predicted value of the characteristic peak-to-peak value offset with temperature rise and the result is updated to the abnormal distribution diagram of thermal response of the color-coated plate coating.

5. The method for detecting coating uniformity of color-coated steel sheets based on spectral analysis according to claim 1, characterized in that: Based on the abnormal distribution map of thermal response of the color-coated plate coating and the pure reflection spectrum and transmission spectrum calibrated by position, the color-coated plate coating topcoat-primer-substrate defect feature fusion analysis is performed to obtain the color-coated plate coating defect feature map. The specific analysis process is as follows: Obtain the set sampling point locations where the color-coated plate coating has abnormalities in the color-coated plate coating thermal response abnormality distribution map, and perform a fusion analysis of the color-coated plate coating topcoat-primer-substrate defect features at the set sampling point locations where the color-coated plate coating has abnormalities; Analysis of defect characteristics of color-coated plate coating topcoat: When the position-calibrated pure reflection spectrum changes suddenly in the 600-700 nm band, but the position-calibrated pure transmission spectrum is normal, if the characteristic peak-to-peak shift lags by more than 15%, it is determined that the topcoat of the color-coated plate is partially poorly cured; Defect feature analysis of color-coated plate coating primer: When the position-calibrated pure transmission spectrum is abnormal in the primer characteristic band, but the position-calibrated pure reflection spectrum is normal, if the peak-to-peak offset of the characteristic peak jumps, it is determined to be micropores or delamination in the primer of the color-coated board coating; Defect feature analysis of color-coated plate coating substrate: When the position-calibrated pure reflection spectrum and transmission spectrum are normal but the characteristic peak-peak offset is higher than the characteristic peak-peak offset threshold stored in the database, it is determined that there is residual oil contamination in the pretreatment of the color-coated plate coating substrate; Based on the fusion analysis results of the defect features of the color-coated plate coating topcoat, primer, and substrate, the thermal response anomaly distribution map of the color-coated plate coating is updated to obtain the color-coated plate coating defect feature map.

6. The method for detecting coating uniformity of color-coated steel sheets based on spectral analysis according to claim 1, characterized in that: The production characteristic data of the color-coated plate is obtained and the uniformity dynamic tolerance set of the color-coated plate is obtained by analysis. The specific analysis process is as follows: Obtain color-coated board production characteristic data, including coating process wet film thickness, coating process electrostatic voltage, and color-coated board production line environmental humidity; Based on the production characteristic data of color-coated steel sheets, the production characteristic factors of color-coated steel sheets are obtained through comprehensive analysis. The production characteristic factors of color-coated steel sheets are used as the analysis basis for obtaining the dynamic tolerance set of color-coated steel sheet uniformity. Obtaining the color-coated plate production characteristic factor-color-coated plate uniformity dynamic tolerance set mapping set stored in the database, and determining a matching color-coated plate uniformity dynamic tolerance set based on the current color-coated plate production characteristic factor; The dynamic tolerance set for uniformity of color-coated steel sheets specifically includes the dynamic tolerance for the number of sampling points for local poor curing of the color-coated steel sheet coating topcoat, the dynamic tolerance for the number of sampling points for micro-holes or delamination in the color-coated steel sheet coating primer, and the dynamic tolerance for the number of sampling points for residual oil stains in the color-coated steel sheet coating substrate pretreatment.

7. The method for detecting coating uniformity of color-coated steel sheets based on spectral analysis according to claim 6, characterized in that: The specific analysis process of the color-coated plate production characteristic factors is as follows: ； Where, is the characteristic factor of color-coated plate production, is the wet film thickness of the coating process, The electrostatic voltage for the coating process, The environmental humidity of the color-coated board production line is For the setting The weight factor, For the setting The weight factor, For the setting The weight factor of .

8. The method for detecting coating uniformity of color-coated steel sheets based on spectral analysis according to claim 7, characterized in that: The color-coated plate coating uniformity calibration is performed in combination with the color-coated plate coating defect characteristic map, and the color-coated plate coating uniformity defect level is output. The specific analysis process is as follows: Based on the color-coated plate coating defect characteristic map, obtain the number of sampling points where the color-coated plate coating topcoat has poor local curing, the number of sampling points where the color-coated plate coating primer has micropores or delamination, and the number of sampling points where the color-coated plate coating substrate has residual oil stains after pretreatment; Obtain the sampling point thresholds for local poor curing of the color-coated plate topcoat, the sampling point thresholds for micropores or delamination of the color-coated plate primer, and the sampling point thresholds for residual oil stains from the pretreatment of the color-coated plate coating substrate stored in the database; The difference between the number of sampling points of local poor curing of the color-coated plate coating surface paint and the threshold value of sampling points of local poor curing of the color-coated plate coating surface paint is recorded as the offset of local poor curing of the color-coated plate coating surface paint; The difference between the number of micropores or delamination sampling points of the color-coated plate coating primer and the threshold value of the micropores or delamination sampling points of the color-coated plate coating primer is recorded as the micropores or delamination offset of the color-coated plate coating primer; The difference between the number of sampling points of residual oil stains on the color-coated plate coating substrate during pretreatment and the threshold of sampling points of residual oil stains on the color-coated plate coating substrate during pretreatment is recorded as the offset of residual oil stains on the color-coated plate coating substrate during pretreatment; If the offset of the local poor curing of the color-coated plate coating topcoat is not less than the dynamic tolerance of the number of sampling points for the local poor curing of the color-coated plate coating topcoat, the color-coated plate coating uniformity is calibrated as the over-limit of the local poor curing of the color-coated plate coating topcoat; If the offset of micro holes or delamination of the color-coated plate coating primer is not less than the dynamic tolerance of the number of sampling points of micro holes or delamination of the color-coated plate coating primer, the color-coated plate coating uniformity calibration is the excess limit of micro holes or delamination of the color-coated plate coating primer; If the offset of the residual oil stains on the color-coated plate coating substrate during pretreatment is not less than the dynamic tolerance of the number of sampling points for the residual oil stains on the color-coated plate coating substrate during pretreatment, the color-coated plate coating uniformity calibration is the excess limit of the residual oil stains on the color-coated plate coating substrate during pretreatment; If there is one or less exceeding limit in the uniformity calibration of the color-coated plate coating, the uniformity defect level of the color-coated plate coating is low; If there are two exceeding limits in the uniformity calibration of the color-coated plate coating, the uniformity defect level of the color-coated plate coating is medium; If there are three exceeding limits in the color-coated plate coating uniformity calibration, the color-coated plate coating uniformity defect level is high.

9. The method for detecting coating uniformity of color-coated steel sheets based on spectral analysis according to claim 8, characterized in that: The closed-loop feedback control scheme for color-coated plate coating is determined based on the uniformity defect level of the color-coated plate coating. The specific analysis process is as follows: The number of sampling points of poor local curing of the color-coated plate topcoat, the number of sampling points of micropores or delamination in the color-coated plate primer, the number of sampling points of residual oil stains in the color-coated plate substrate pretreatment, and the dynamic tolerance set of the color-coated plate uniformity are used as inputs to the trained graph neural network model based on causal reasoning. Output the closed-loop feedback control plan for the color-coated plate coating, including the updated spray gun atomization pressure value, updated substrate preheating temperature value, updated baking time, and updated production line transmission speed value; Automatically adjust the color-coated plate production line parameters based on the color-coated plate coating closed-loop feedback control solution.

10. A color-coated plate coating uniformity detection system based on spectral analysis, applied to the color-coated plate coating uniformity detection method based on spectral analysis according to any one of claims 1 to 9, characterized in that: include: The dual-channel spectrum synchronous acquisition module is used to synchronously acquire the reflection and transmission dual-channel spectra of the color-coated plate coating, and output the original reflection spectrum matrix and transmission spectrum matrix bound to the spatial coordinates; The dual-channel spectral calibration module is used to collect the jitter offset during the color-coated board production process and the background blackbody radiation spectrum when no color-coated boards pass through the production line. It performs dynamic distortion correction and noise removal on the original reflection spectrum matrix and transmission spectrum matrix, and outputs pure reflection spectrum and transmission spectrum with position calibration. The color-coated plate coating abnormality diagnosis module is used to increase the ambient temperature of the color-coated plate production line. It combines the position-calibrated pure reflection spectrum and transmission spectrum to form a color-coated plate coating thermal response abnormality distribution map, and performs abnormal diagnosis of the color-coated plate coating. The coating defect feature map analysis module is used to perform a fusion analysis of the topcoat, primer, and substrate defect features of the color-coated plate coating based on the abnormal distribution map of the color-coated plate coating's thermal response and the position-calibrated pure reflection spectrum and transmission spectrum, thereby obtaining a color-coated plate coating defect feature map. The color-coated plate coating uniformity calibration module is used to obtain color-coated plate production characteristic data, analyze and obtain the color-coated plate uniformity dynamic tolerance set, calibrate the color-coated plate coating uniformity based on the color-coated plate coating defect characteristic map, output the color-coated plate coating uniformity defect level, and determine the color-coated plate coating closed-loop feedback control scheme based on the color-coated plate coating uniformity defect level.

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